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2017 ; 8
(ä): 1337
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NLRP3 Inflammasome Mediates Dormant Neutrophil Recruitment following Sterile Lung
Injury and Protects against Subsequent Bacterial Pneumonia in Mice
#MMPMID29163464
Tian X
; Sun H
; Casbon AJ
; Lim E
; Francis KP
; Hellman J
; Prakash A
Front Immunol
2017[]; 8
(ä): 1337
PMID29163464
show ga
Sterile lung injury is an important clinical problem that complicates the course
of severely ill patients. Interruption of blood flow, namely ischemia-reperfusion
(IR), initiates a sterile inflammatory response in the lung that is believed to
be maladaptive. The rationale for this study was to elucidate the molecular basis
for lung IR inflammation and whether it is maladaptive or beneficial. Using a
mouse model of lung IR, we demonstrate that sequential blocking of inflammasomes
[specifically, NOD-, LRR-, and pyrin domain-containing 3 (NLRP3)], inflammatory
caspases, and interleukin (IL)-1?, all resulted in an attenuated inflammatory
response. IL-1? production appeared to predominantly originate in conjunction
with alveolar type 2 epithelial cells. Lung IR injury recruited unactivated or
dormant neutrophils producing less reactive oxygen species thereby challenging
the notion that recruited neutrophils are terminally activated. However, lung IR
inflammation was able to limit or reduce the bacterial burden from subsequent
experimentally induced pneumonia. Notably, inflammasome-deficient mice were
unable to alter this bacterial burden following IR. Thus, we conclude that the
NLRP3 inflammasome, through IL-1? production, regulates lung IR inflammation,
which includes recruitment of dormant neutrophils. The sterile IR inflammatory
response appears to serve an important function in inducing resistance to
subsequent bacterial pneumonia and may constitute a critical part of early host
responses to infection in trauma.